The original vampiric association with Dracula was through Vlad III, known was Vlad Tepes, Tepes meaning Impaler. Curiously, Dracula was Vlad’s family name, the patronym. The internet doesn’t tell me much more than that, which is why this post has been in my drafts folder for seven months…

(EDIT: Commenter oetpay assisted with a link below, which explains that Vlad Dracul-ea means son of (-ea) Vlad Dracul, who was associated through dragons through the family heraldic crest. So it turns out that analyzing dracula and chocula as little dragons and little chocolate is not historically accurate. But we could say Count Chocula is son of Count Chocul.)